p3dx not communicating perfectly with laptop

asked 2013-12-22 05:55:15 -0500

Ashesh Goswami gravatar image

Hi, I am trying to do some work related to obstacle detection and avoidance using SICK laser scanner and p3dx robot. I was using the same 3 robots for the past one month. However, since the past two weeks the p3dx has stopped communicating with my laptop.

Once I run the command rosrun ROSARIA RosAria I get the following output:

Could not connect to simulator, connecting to robot through serial port /dev/ttyUSB0.
    Syncing 0
    Syncing 1
    Syncing 2
    Connected to robot.
    Name: Purdue_2051
    Type: Pioneer
    Subtype: p3dx
    ArConfig: Config version: 2.0
    Loaded robot parameters from p3dx.p
    ArRobotConnector: Connecting to MTX batteries (if neccesary)...
    ArRobotConnector: Connecting to MTX sonar (if neccesary)...
    [ INFO] [1387734063.988735382]: Setting TicksMM from ROS Parameter: 128
    [ INFO] [1387734063.992513924]: Setting DriftFactor from ROS Parameter: 0
    [ INFO] [1387734063.996264262]: Setting RevCount from ROS Parameter: 16570
    [ INFO] [1387734064.020029650]: RosAria: publishing new recharge state -1.
    [ INFO] [1387734064.020206305]: RosAria: publishing new motors state 0.
    [ INFO] [1387734064.102186591]: RosAria: publishing new motors state 1.

Now, if I check for rostopic list, i get the following:


However, if I try to publish any of the topics with Rosaria, say

rostopic echo /RosAria/pose

nothing happens. Even if I try to publish velocity commands, nothing happens and the robot does not move. But the SICK laser works fine and I can perform all necessary actions of obstacle detection for the stationary robot using the sensor. Can anyone please suggest what could be going wrong? Is there anything that I am missing or anything that I can do to debug this issue? Thanks a lot in advance.

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Are you connecting via WiFi to a host computer on the robot? I have seen a similar problem where hostfile entries do not match IP addresses.

JonW gravatar image JonW  ( 2013-12-22 20:30:56 -0500 )edit

there is no host computer on the robot...am using my laptop to run the robot through serial communication..

Ashesh Goswami gravatar image Ashesh Goswami  ( 2013-12-23 05:20:50 -0500 )edit

It just randomly started working. I do not know the reason but it behaves very abruptly. But for now, everything works fine. Thanks

Ashesh Goswami gravatar image Ashesh Goswami  ( 2013-12-28 07:19:23 -0500 )edit